E-mail - Order to Brian Carling, AF4K
Several crystals now available - see list below with pricing.
During WWII these quartz crystals were manufactured for use in military vehicle radios.
There are two series of these FT-241 crystals, those marked with "two digit" channel numbers,
and those with "three digit" channel numbers. These crystals are marked for frequencies
in the 20 - 40 mhz range, but the fundamental frequencies are much lower.
Some of the crystals fall in the 455 khz range, and were used by homebrew radio builders in
the 1950's to make crystal filters, especially for SSB receivers and transmitters
(see 1950s ARRL handbooks).
Crystal FT-241
Dimensions (WHD) 29 x 39 x 12 mm / 1.1 x 1.5 x 0.5 inch
Notes FT-241 crystals, black body, were used in the BC-604 with a working frequency 20-27.9 MHz,
80 "channels" numbered 0-79.
Their fundamental frequency is 370.370 - 516.666 kHz, to be multiplied by 54.
FT-241 crystals, brown body, were used in the BC-684 with a working frequency 27-38.9 MHz,
120 "channels" numbered 270-389.
Their fundamental frequency is 375.000 - 540.277 kHz, to be multiplied by 72.
These crystals have a very interesting fundamental frequency range to compose sharp
I.F. filters around 450-475 kHz.
Example: Channel 68 = 496.3 kHz.
Ehe N4JVP calculator may be found online here:
CLICK HERE for CALCULATOR - thanks, Fritz!
These can be used for experimenting and for use as a crystal lattice filter since several
are on the same frequecies. (These have the same pins as the popular FT243 crystals and use
the same socket but the body is slightly wider.)
These are available for $4.00 each plus shipping
QTY 2 - Channel 11 = kHz
QTY 1 - Channel 36 = kHz
QTY 1 - Channel 344 = kHz
QTY 1 - Channel 811 = kHz
QTY 1 - Channel 930 = kHz
QTY 1 - Channel 968 = kHz
E-mail me to inquire or purchase these. Click here.
I will post more here soon.
QTY 100 (APPROX.) FT243 CRYSTAL BLANKS
I have available about 100 nice clean quartz crystals made for
use in FT243 holders. Supplied with the metal electrode plates.
These are a nice mix from about 1000 kHz up to 8500 kHz.
See photo below:
I will sell the whole bunch for $15.00 plus $5.00 for USA Shipping.
Contact plates are also available; Quantity 100 for $5.00 plus shipping Inquire by e-mail. Click here.
FT243 springs are also available; Quantity 100 for $5.00 plus shipping Inquire by e-mail. Click here.
Phenolic insulators are also available; Quantity 100 for $5.00 plus shipping Inquire by e-mail. Click here.
Copper, tin and brass electrodes (mixed) are also available; Quantity 100 for $5.00 plus shipping Inquire by e-mail. Click here.
DC34 (BC669) CRYSTALS - CLICK HERE FOR LIST.
FT243 CRYSTALS - CLICK HERE FOR LIST.
8 MHz FT243 CRYSTALS - CLICK HERE FOR LIST.
AM Broadcast Band FT243 CRYSTALS - CLICK HERE FOR LIST.
HC49U CRYSTALS - CLICK HERE FOR LIST.
HC-6/U CRYSTALS - CLICK HERE FOR LIST.
Add shipping costs to all prices!
73 from Brian ((( Amateur Radio G3XLQ / AF4K )))
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